This is the 8525th most frequent German word.
klaus
"Klaus" is a German male given name, equivalent to "Nicholas" in English.
In this sentence, 'Klaus' is used as a proper noun, referring to the name of a person.
Klaus ist ein sehr guter Freund von mir.
Klaus is a very good friend of mine.
Here, 'Klausur' is used as a noun to mean 'exam,' showing a different form of the root 'klaus'.
Die Klausur war sehr schwierig.
The exam was very difficult.
In this example, 'Klaus' could colloquially refer to a specific context or discussion, depending on regional usage or emphasis.